“Thank you so very much for your help. Your calm and patient demeanour and clear competence really did take the stress out of all of it.”
Senior Executive, Financial services
Mark is a Senior Associate in the Employment team. He advises senior employees and partners who have been dismissed or discriminated against and employers or partnerships dealing with difficult and complicated employment disputes.
Mark helps his clients reach favourable resolutions to disputes before they end up in courts or tribunals. If litigation cannot be avoided, Mark is an experienced litigator and a sophisticated strategist. He gets to know his clients, ensuring they are comfortable discussing their employment problems openly and honestly.
Mark cut his teeth in employment law acting for trade union members, so he understands the emotional effects of dismissal and discrimination. He knows what his individual clients want, knows the pitfalls to avoid for employers and understands the sensitivities in unionised workforces.
Mark specialises in complex and high-value employment litigation including in whistleblowing, discrimination, state immunity, employment status and equal pay. He advises employees and employers on complex investigations, post-termination restrictions, sexual misconduct in the workplace and TUPE.
Mark is an experienced adviser in finance, medicine, academia, law, technology and the civil service.
Recent work
- Mark is acting for individuals on complex and long-running litigation involving board disputes and state immunity.
- Mark is advising employers and senior executives on investigations and high value exits.
What clients and directories say
Mark and Adele stand out for their exceptional expertise in employment law and their consistently hands-on, practical approach. What sets them apart from competitors is their ability to combine deep legal knowledge with a genuine understanding of the organisational context in which we operate. They are approachable, responsive, and always willing to engage directly with complex issues, often at short notice. I’ve particularly valued their clarity, calmness under pressure, and the confidence they inspire in both HR and senior leadership. Their support feels like a true partnership, which is rare and highly valued."
Legal 500 UK, 2026
Mark McWilliams was excellent. He provided prompt, strategic advice... I felt he went the extra mile and I trusted his advice. I was also experiencing serious mental health issues but his advice and manner were calm reassuring and, as a lawyer myself, I felt he was the perfect 'lawyer's lawyer.'
Senior in-house solicitor
My experience with Mark was super positive. He was supportive throughout. The advice provided was clear and considered. I am really glad to have worked with him as he really provided a sense of calm and reassurance through what was an extremely stressful and protracted process with my former employer.
Senior Executive, Finance
I felt like Mark and the team really took the time to understand my situation. Other firms I spoke with were quick to dismiss my situation, telling me it was pointless to pursue anything. Mark was the first person to say I had a viable case
Senior Executive, Technology
PROFESSIONAL SOCIETIES AND Memberships
- Employment Lawyers Association
- Discrimination Law Association (DLA)
- Industrial Law Society (ILS)
“Mark has been utterly incredible during this rather challenging period in my life. He worked on my case for 18 months or so and was always been the legal and at times the emotional support I have needed. His patience and professionalism are faultless, and I feel so lucky to have had him assigned to my case.”
Senior Executive, Marketing
Mark was supportive in every sense, being concerned for my wellbeing as well as the legal situation. Mark helped me reach a successful outcome and I could not recommend his services more.”
Senior Executive, Financial Services
